You're bluffing. You're bluffing. Shifu didn't teach you that.
5 seconds sound clip from the Kung Fu Panda movie soundboard.
You can hear this line at 01:19:40 in the Blu-ray version of the movie.
Quote context
[...]
- You... you're just a big fat panda!
- I'm not a big fat panda. I'm the big fat panda.
- You're bluffing. You're bluffing. Shifu didn't teach you that.
- Nope. I figured it out. Skadoosh.
- That's my boy! That big lovely kung fu warrior is my son! Yes!
[...]